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<br />CISO GUI (CISO is command line-based): Drag-and-drop ISO file on program, Select compression level (1 to 9 (Max)), "Compress", and choose directory for saving the new CSO file.
<br />UMDGen is a PSP ISO editor. You can save to either the CSO format with this.
→PlayStation Portable: (m) moved "instructions" away from the summary
* '''Gain:''' Immediate (ISO dump size lowers). Substantial, depending on game. Higher compression levels generally produce decreasing space gains while potentially increasing load times. Some tools allow for leaving audio/video content uncompressed.
* '''Tools Used:''' CISO, CISO GUI, maxcso, UMDGen, PSP ISO Compressor, CISO Multi Compressor, CISO XP, ...
* '''Can be reverted?''' Yes, using the same tools and saving in ISO (uncompressed) format. No data loss.
* '''Playable on Hardware?''' Yes - most CFWs (Possibly longer load times though).
* '''Playable on Emulators?''' Yes - PPSSPP.
CISO GUI and CISO XP: Drag-and-drop ISO file on program, Select compression level (1 to 9 (Max)), "Compress", and choose directory for saving the new CSO file.
UMDGen is a PSP ISO editor. You can save to either the CSO format with this.
===DAX, JSO, ZSO===
